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參數資料
| 型號： | HFA1135EVAL |
| 廠商： | Intersil Corporation |
| 英文描述： | 360MHz, Low Power, Video Operational Amplifier with Output Limiting |
| 中文描述： | 360MHz，低功耗，視頻運算放大器輸出的限制 |
| 文件頁數： | 7/15頁 |
| 文件大小： | 220K |
| 代理商： | HFA1135EVAL |
7
When the output is limited, the negative input continues to
source a slewing current (I
LIMIT
) in an attempt to force the
output to the quiescent voltage defined by the input. Q
P5
must sink this current while limiting, because the -IN current
is always mirrored onto the high impedance node. The
limiting current is calculated as:
I
LIMIT
= (V
-IN
- V
OUT LIMITED
)/R
F
+ V
-IN
/R
G
.
As an example, a unity gain circuit with V
IN
= 2V, and V
H
= 1V,
would have I
LIMIT
= (2V - 1V)/1.5k
+ 2V/
∞
= 667
μ
A (R
G
=
∞
for unity gain applications). Note that I
CC
increases by I
LIMIT
when the output is limited.
Limit Accuracy
The limited output voltage will not be exactly equal to the
voltage applied to V
H
or V
L
. Offset errors, mostly due to VBE
mismatches, necessitate a limit accuracy parameter which is
found in the device specifications. Limit accuracy is a
function of the limiting conditions. Referring again to Figure
3, it can be seen that one component of limit accuracy is the
V
BE
mismatch between the Q
X6
transistors, and the Q
X5
transistors. If the transistors always ran at the same current
level there would be no V
BE
mismatch, and no contribution
to the inaccuracy. The Q
X6
transistors are biased at a
constant current, but as described earlier, the current
through Q
X5
is equivalent to I
LIMIT
. V
BE
increases as I
LIMIT
increases, causing the limited output voltage to increase as
well. I
LIMIT
is a function of the overdrive level
((A
V
x V
IN
- V
LIMIT
) / V
LIMIT
), so limit accuracy degrades as
the overdrive increases. For example, accuracy degrades
from +15mV to +70mV when the overdrive increases from
100% to 200% (A
V
= +2, V
H
= 500mV, R
F
= 250
).
Consideration must also be given to the fact that the limit
voltages have an effect on amplifier linearity. The “Linearity
Near Limit Voltage” curves, Figures 34 and 35, illustrate the
impact of several limit levels on linearity.
Limit Range
Unlike some competitor devices, both V
H
and V
L
have usable
ranges that cross 0V. While V
H
must be more positive than
V
L
, both may be positive or negative, within the range
restrictions indicated in the specifications. For example, the
HFA1135 could be limited to ECL output levels by setting
V
H
= -0.8V and V
L
= -1.8V. V
H
and V
L
may be connected to
the same voltage (GND for instance) but the result won’t be a
DC output voltage from an AC input signal. A 150mV - 200mV
AC signal will still be present at the output.
Recovery from Overdrive
The output voltage remains at the limit level as long as the
overdrive condition remains. When the input voltage drops
below the overdrive level (V
LIMIT
/A
V
) the amplifier returns to
linear operation. A time delay, known as the Overdrive
Recovery Time, is required for this resumption of linear
operation. Overdrive recovery time is defined as the
difference between the amplifier’s propagation delay exiting
limiting and the amplifier’s normal propagation delay, and it is
a strong function of the overdrive level. Figure 36 details the
overdrive recovery time for various limit and overdrive levels.
Benefits of Output Limiting
The plots of “Pulse Response Without Limiting” and “Pulse
Response With Limiting” (Figures 4 and 5) highlight the
advantages of output limiting. Besides the obvious benefit of
constraining the output swing to a defined range, limiting the
output excursions also keeps the output transistors from
saturating, which prevents unwanted saturation artifacts
from distorting the output signal. Output limiting also takes
advantage of the HFA1135’s ultra-fast overdrive recovery
time, reducing the recovery time from 2.3ns to 0.3ns, based
on the amplifier’s normal propagation delay of 1.2ns.
FIGURE 4. PULSE RESPONSE WITHOUT LIMITING
FIGURE 5. PULSE RESPONSE WITH LIMITING
TIME (5ns/DIV.)
I
A
V
= +2, R
F
= 250
0
OUT
-0.5
-1.0
0.5
1.0
1.5
2.0
O
0
-1.0
-2.0
1.0
2.0
3.0
4.0
IN
TIME (5ns/DIV.)
I
A
V
= +2, R
F
= 250
0
OUT
V
H
= +2.0V, V
L
= 0V
0.5
1.0
-0.5
IN
O
0
1.0
2.0
-1.0
-1.0
1.5
2.0
HFA1135
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相關代理商/技術參數 |
參數描述 |
|---|---|
| HFA1135IB | 制造商:Intersil Corporation 功能描述:360MHz, Low Power, Video Operational Amplifier with Output Limiting |
| HFA1135IB96 | 功能描述:IC OPAMP CFA 360MHZ 8-SOIC RoHS:否 類別:集成電路 (IC) >> 線性 - 放大器 - 視頻放大器和頻緩沖器 系列:- 產品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:50 系列:- 應用:TFT-LCD 面板：VCOM 驅動器 輸出類型:滿擺幅 電路數:1 -3db帶寬:35MHz 轉換速率:40 V/µs 電流 - 電源:3.7mA 電流 - 輸出 / 通道:1.3A 電壓 - 電源，單路/雙路(±):9 V ~ 20 V，±4.5 V ~ 10 V 安裝類型:表面貼裝 封裝/外殼:8-TSSOP，8-MSOP（0.118"，3.00mm 寬）裸露焊盤 供應商設備封裝:8-uMax-EP 包裝:管件 |
| HFA1135IBZ | 功能描述:視頻放大器 W/ANNEAL OPAMP 360MH ZCFBLIMIT8SOICIND RoHS:否 制造商:ON Semiconductor 通道數量:4 電源類型: 工作電源電壓:3.3 V, 5 V 電源電流: 最小工作溫度: 最大工作溫度: 封裝 / 箱體:TSSOP-14 封裝:Reel |
| HFA1135IBZ | 制造商:Intersil Corporation 功能描述:IC VIDEO OP AMP 360MHZ |
| HFA1135IBZ96 | 功能描述:視頻放大器 W/ANNEAL OPAMP 360MHZ CFB LIMIT IND RoHS:否 制造商:ON Semiconductor 通道數量:4 電源類型: 工作電源電壓:3.3 V, 5 V 電源電流: 最小工作溫度: 最大工作溫度: 封裝 / 箱體:TSSOP-14 封裝:Reel |
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